1. School of Materials Science and Engineering，Hubei University of Automotive Technology, Shiyan 442002，
China； 2. School of Materials Science and Engineering，Hefei University of Technology，Hefei 230009，China；
3.Dongfeng forging Co.，Ltd，Shiyan 442052，China
Abstract：Powder metallurgy is a kind of green manufacturing technology with high efficiency, low consumption
and material saving. However, the powder metallurgy parts have pores, uneven density, low strength and hardness,
which limit its applications. This paper mainly studies the powder metallurgy forming and sintering process flow of
the sprocket of the oil pump transmission mechanism, as well as the inductor design and the key parameters of the
induction quenching process of the sprocket. The results show that the density of the sprocket compaction is higher
than 6.7 g/cm3, and the hardness of the sprocket compaction reaches 76HRB after copper penetration and sintering
at 1 100-1 120 ℃. The hardness of the sprocket compaction reaches 71HRA after induction quenching with 60kW
power, which meets the performance requirements of the product. The service life of sprocket is extended effectively.
2022, Vol. 32 
